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Current in a circuit falls from 5.0 A to...

Current in a circuit falls from 5.0 A to 0.0 A in 0.1 s. If an average emf of 200 V induced, give an estimate of the self-inductance of the circuit.

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Change in current, dI= 5-0 =5A, Time taken in current change dt = 0.1s Induced average emf `e_(av)= 200 V` Induced emf in the circuit `e =L (dI)/(dt) Rightarrow 200=L((5)/(0.1)) or L=(200)/(50)=4H
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Knowledge Check

  • Consider a current in a circuit falls from 6.0 A to 1.0 A in 0.2 s. If an average emf of 150 V is induced by the circuit, then the self inductance of the circuit is

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  • A varying current in a coil changes from 10A to zero in 0.5 s. If the the average emf induced in the coil 220V, the self inductance of the coil is

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